That's not nice. When did you other parent married your stepfather?
my parents have stayed married so i still have my biological father as my dad
My relationship with my Stepfather was always cold.
A stepfather or stepdad is a non-biological father figure who is married to one's parent.
Мои отношения с отчимом всегда были холодными.
Отчим - это небиологическая фигура отца, состоящая в браке с одним из родителей.